Question about 1999 Ford Crown Victoria
DE CODE PO420 CAME BACK EVERY 2-5 DAYS
Disconnect your battery for five minutes. That will reset your computer. When the problem happens again, take your car to Auto Zone or Advanced Auto. They have a code reader and will tell you what the problem is. This is a free service. Good luck
Posted on Aug 09, 2008
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Posted on Jan 02, 2017
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